Typewriting machine



June 3, 1930.'4 A; F. LEAR f 1,761,080

TYPEWRITNG MACHINE Filed Dec. 9, 192e Patented June l3, 1930 l Y,

Anrtiin LEAR, orfBnoovKiYNQN'Ei/U fYoRKQ AssreNoit fro.unnnitwoonnrrrorr msHnReoMPANxq, F yNEW Yomg N. Y., A CORPORATION or DELAWAnEH c bushings set' in ythe baseboard,.and each screwv K. myrnwnrrrne MACHINE" Application :ned Deember-s, 192e.' 'semifini 15335072-r-r` i invention relates to portabler;tylie-` writingk machines, and more .particularly to means for mounting theV typewriter within 'a portable carryingcase to withstand'tlie' shocky and abuse incident' to transportation. f yThe invention maybe regardedas an 11nprovementy on theY pending.- applicat-ion of Villiam-AglDobson, ileclOctober 29, 1925, Serial No.16`55524, where the Aforward part ofk -theinachine is held in position `on the baseboardJ by aV pair oi screwsf passing Vthrough holes lin bracketssecured tothe machineside' frames and-enteringfthe 4threaded holes in having a spring compressible V'between v the head of .the screw andthebracket-to resilient-v ly hold' I the machine.v clampedfito the; base-l board. 1 The shaking and jarring 'of the carry-' ing ease in handy transportation frequently causedlone or both of the screws to Floosen,"Y Vleavin-g the machine loose'withinthe y.carrying: case. careless.l assembler would fre` quently turn the screws so far as to ullycompress the springs between thev heads vof the .screws 'land .the brackets, thus Vdestroying)the function oit'.l the ispringsas cushion elements,y and sometimes 4the threading offthescrews wouldb'end. .down the ears .of the i brackets into 'ContactwithV the vbaseb'oard;v Sometimes the. assembler l'would not compress the springs. suiiciently..l

' feature 'of the'presentrinventioniris'to"v provide means to overcome-these objections.l

. For this fpurpose there is provided a springf tensionvga'ge lin the orm'of a shoulder upon ascrew, Vthe shoulder off which A extends through the opening 4in the lugfand thethread portion of the' screwis screwedV intola-bushingin the casing,'untiljthe shoulderff contacts with the casingfthereby permitting# the s c'rew to be tightened, Vwithoutcausing any damage, as tight'aslpossible. l*Between* the lug -andfthehead of thescrew-'therefis v provided fa spring, and throughVv the action of this springthe lug is pressed downwardly,V

therebyholding the typewriter inf place.y

When the machine-*is now being carried around and generally handled, lall-the jars will Vbe absorbed by' the spring, arid in thisway no injury can-foccurto either the type-Y the threads the` x whichv Vthe `screw is threaded. -f A Modern product-ion methods yrequire I inten-t Vchangeability of parts and the assemblyof these parts under conditions that requirfefias` little ymental efort `andskill7 on; the part-of the assembler",k as possible; f *The rpresent imzl provement f" profvidesr` means fr whereby? .'f'the.

screws may be manually; turned Sinto@ their .sleeves in the .baseboardf ,.toafmechan'cally ixed depth, and the assembler has Only'to vseethat thefscrews `rare set tight. VThe assemblingand settingv of the .screws cannot' either lessen or; increase the .predetermined 'jcom ,pression of thesprings under'the screw-heads;

and. each andV every machine assembledtoza' baseboard. will .beheld f uniformly: in.A 'suspen-. sion between the. rubber `feetv on :the'unden side and.r a predetermined `spring "compression"fat"y 'the upperl side thereof, :over'jwhich' the assemblerhas no2 control; .Y To this end, the'lamping screws arepro-r vided with-gages int-he formfof shoulders;y the length of thesho-ulder underveachheadashoulder orgage willengage the exposed yend Y of the metallic bushing. Thus lthes'crewv is" tightened, which heretofore "hasffbeerf 'left" loose, and` this tightening .prevents accidental loosening oithefscrew when properlyseand p it also .prevents bending land breakingfgofthe screw. -by enclosingfthef `whole threaded psec4 tion of the screwwithinfthepbushing.: :lumi:

- They -iianged'f head" of :-theabushing-prevents" the bushing 1 from being vfpulledf f through fthe;

board ilby the screwgfrand :thezlength of? .the bushing .provides for .along-.threaded section. n

for the screw lpermittiiig ythe-fuse Yof? sufficient j threads5 {Lto-.1 prevent. the '.fstrippingz ofy the. threads throughfthefcareless use ofthefscrew-f driver. The'compressin .springs `are formedV allowance for compression'fbytheiscrewsffor:

jected to in transportation. These simple but very important changes in the construction and organization of the screws, the bushings and the springs, render the screws and springs interchangeable at any time and place to produce the same uniform results of preventing the screws from loosening,.and preventing an over or under compression of the machine cushioning springs.

A Oth'erfeature's and advantages will herein'- after appear; v

In the accompanying drawings,

Figure 1 is a longitudinal vertical section through the baseboard of a portable carrying case, showing the frame of a portable machine 'secured thereto according to the present invention. TheV cover that usually vcloses the machine on the top and four sides is not being shown. 1 Y Y :Figure 2 is aA vertical cross-section through Figure 1, `on, a. plane indicatedon the line 2L2, looking inthe direction of the arrow.

: Figui-e3 is an enlarged view, in perspectivefshowing in. detail the several parts fof one machine-clamping screw assembled in Y operative position..

10 indicates a baseboard having recesses in the upper vfacethereof t'o-form machine-centering sockets 11 for the reception of the rubberfeet l2'secured to the lower-edges of the machine-frame 13. The baseboard may also be provided with cushioning feet 14.

Therear wall `15 of the machine-frame 13 is formed witha central opening 16 to receive the free endof. a machine-retaining ear 17 formed at the upper end of a bracket 18, secured to thebase board 10, as by screws 19. The' ear1'7 maybe covered, as by stretching a section of. rubber tubing 20 thereover to insulate the ear from the edges of the opening lfinthe machine-frame. The machine may be 'setv upon the baseboard and shoved rear- Wa'rdlyto cause .the rubber-incased ear 17 to Aenter thelopening 16 in the rear wall thereof to approximately vcenter the machine to the board and assist in aligning the rubber feet 12 within the sockets 11, the ear 17 preventingl the two rear feeton the machine-frame fronib'eing lifted outof its sockets.'

.To coact with the central ear 17 at lthe rear Walliof the frame, meansare provided at each forwardend ofthe lside walls-:21 of the machine tol'further secure the machine to the basevatf two widely-separated points that assume'a triangular relation to the central ear 17 atthe rear `of the frame. These means include brackets. r22 located upon the. frontl facesfoftheside'walls21 of theframe by do'wels 23 and secured thereto byrscrews 24, and each bracket formed with an vextension 25 that; projects forwardly ofthe frame parallel to the upper -face of the baseboard with vsuitable:clearance-space"between th-e extension a-ndthe baseboard. a-ndfalso formed -witha perforation26...x i

lindrical section 31 shouldered" down to the size of the threads, the shoulder so formed serving to limit the threading of the screw yinto the Vbushing 27 byengaging the face of the bushing, and when the screw, as a whole, is set against the bushing, accidental looseningof the ,threaded bushingis prevented. rlhe cylindrical' section 31 lof each screw passes through the clearance-perforations 26 of the .extensions 25, and, between said eX-,

tensions and the head-32 of each screw, a=coil compression spring 33 encircles the section 31.

. As already described, the machine-frame is first assembled to the -baseboardby eecting an interlock between the ear 17 and the open-V ign 16--in the rear wall 15 thereof, withthe feet of the machine Vresting within the sockets 11. v |The screws-30 with, the springs 33 under the heads 32 thereof are dropped through the perforations 26 of the extensions 25, and each screw threaded home with the shoulder thereof jammed against the face of the bushing;. The'threading-in of the screws vcompresses the springs 33 a predetermined ex-V tent between the heads 32'and the extensions 25, making it impossible for the assembler or novice, in clampingany machine to the baseboard,` to` change the compression of the springs-over or under a predetermined -degrec fortension. Furthermore,'the efect. of setting the screws against the'faces of the bushings prevents the screws. from being shaken loose in transportation, gives greater strength to the threaded sections through their being whollyeincased within the bushings, and prevents stripping of thethreads because of the long: threaded engagement of the screws within the long bushings. f n It will be understood that the base board l0, that supportsV the typ-ewriting machine, forms a part-0f a portablecarrying case, the otherrpart of the case being a cover, not shown, that sets, overv the base board to enclose the machine on thertop and four sides,

in the usual manner. Y n

n Variations maybe resorted to within the scope of ther-invention, and portions of the improvements may be used without others.

l-Iaving'thus described my invention, l

claim: e Y l Y 1. In a portable typewriting machine hav'-v inga--frame with a frontwall and a rear wall 4formed withia `central opening and a casing, the combination with means mounted Y upon1 the casing and arranged to `enter the Y sertion of the screws into the casing, and means to limit the amount of said insertion opening in the frame to center and secure the rearof the frame to the casing, of a pair of brackets secured to the front wall of theA frame, a pair of shouldered screws to pass through the brackets, a pair of springs compressible more or less by the screws against said brackets, and a pair of threaded bushings or nuts secured to the casingto engage the screws, whereby the front wall of the frame will be resiliently clamped tothe casing through the compression of the springs, the shoulders of the screws engaging the faces of the nuts as gages to limit the comi pression of the springs and also by friction to prevent accidental loosening of the screws.- 2. In a portable typewriting machine haV- c ing a frame and a casing, the combination with a hook on the casing to mterlock with the frame to hold down the rear end of thel frame, of adjustable means yieldably holding Y down the front of the machine, said means including headed screws passing through parts of the frame and threaded into the casing, springs mounted on the screws between the heads thereof andthe frame, effectiveto be more or less compressed by the degree of into prevent over-compression of the springs.

3. In a portable typewriting machine h aV-' ing a frame with a front wall and an apertured rear wall, and a casing supporting the machine, the combination with means mounted upon the casing and arranged to enter said aperture in the rear wall to center andsen Y, cure the frame tothe casing, of headed screws passing through said front wall of the frame, y springs mounted on the screws under the y Y heads thereof and bearing against the frame and rcompressible by they screws-to a greater or less degree, and means on the casing effective to co-operate with the screws to limit the i" degree to which said'springs maybe compressed, whereby the front wall of the frame rear of the frame to the base, of a shouldered Y will be resiliently clamped tothe casing by a predetermined compression of the springs by the screws. Y

4. In a portable typewriting machine, the combination with a frame'including a front wall and an apertured rear wall, a base upon which the machine is mounted, andmeans on ,Y

the base engaging said aperture to secure the screw carried by thefront wall of the frame and assembled to the base,` a head on said between said headand the front wall, effective when assembled to press said wall downward against the base, and a 'nut in the base to receive the'threaded end of the screw,'said shoulder of the screw engaging the face of the nut as a gage to limit the degree of com- Q pression of the spring.v

ARTHUR rilassa.A 

